You should take a look at http://tamrielfoundry.com/templar/ , Templars have very nice abilities for tanking
-Focused Charge
-Sun Shield
-Spear Wall
-Balanced Warrior
-Backlash
-Eclypse
-Blinding Light
-Illuminate
-Restoring Aura
All of the above are good tanking abilities from the templar's skill trees so you can tank as a templar any time
Actually, I firmly believe any class can tank effectively.
http://tamrielfoundry.com/dragonknight/
-Fiery Reach
-Spike Armor
-Reflective Scales
-Inhale
-Iron Skin
-Burning Heart
-Elder Dragon
-Scaled Armor
-Obsidian Shield
-Ash Cloud
Above are good Dragonknight tanking abilities
Even a sorcerer could make a good tank: http://tamrielfoundry.com/sorcerer/
-Lightning Form
-Bound Armor
-Conjured Ward
-Daedric Protection
Along with a summoned daedra to help you
And the nightblade? http://tamrielfoundry.com/nightblade/
-Teleport Strike
-Blur
-Summon Shade
-Aspect of Terror? (not sure, the description is vague)
-Fortitude
-Strife
-Drain Power
-Catalyst
-Soul Siphoner
My point is that I'm confident any class can be a good tank, your opinion might differ from mine on some abilities I included or did not include, but you get my meaning